(WRT54G) and (BEFVP41) Two Lan

I want to establish a VPN connection. I have a router at my home and another at office and I use SSH Sentinel software because my router at my house is not VPN. Therefore, I have two networks. My problem is about my router at home (WRT54G) because when I remove it, I have no problem and my connection is established successful. But when I connect my router, my connection is too established successful but I can't to connect to my server at work. I can't ping my router and my my server at work? Please help me